Love this game! It's clear that you've put a huge amount of effort into it.
The one major issue I have is that after Nel decides to have sex with enemies it takes her several times longer to get through the day than it is before getting her friendship level up. Its just a pain and drags on far too long as she waits for each monster to finally grab her instead of attacking.
I suggest adding an option to limit how many times she decides to have fun with enemies on each "outing" as Celica. You could make it seem organic by having Celica set ground rules before pocession or something.
Again, love the game and am looking forward to its future.